User Guide

7
Jobsite experience:
The mechanical properties of a base material, especially masonry, are not always
what you would expect. Some weaker-looking bricks will deliver the tension values
you expect, while others that you’d expect to manage higher tension loads, fall short.
In one specific case, Hilti assisted a team on-site who estimated that the capacity of
an anchor installed in a brick wall would be at least the minimum of our allowable
load. He estimated right, but the design still has to be changed.
The injectable adhesive bonded effectively with the brick – no remarks there. As we
performed on-site testing with the allowable load as unconfined test (wide support)
the brick was pulled right out of the masonry wall. The masonry mortar, which was
like fine-grained powder, was to blame. So, the Engineer chose to re-assess his
design thanks to this sobering demonstration.